The personal driving experience is a crucial criterion to attract customers, influence buying decision and improve customer acceptance. By calibration of drivability related ECU functions the particular vehicle behaviour (comfort, sport) can be achieved. In this context the calibration of the behaviour of the combustion engine during transition from negative (drag torque) to positive torque (Tip In) and vice versa (Tip Out) is very important. The conventional calibration of drivability functions is carried out by a calibration engineer by driving time consuming tests on the test track utilising expensive prototype vehicles for a long time for these calibration activities. Based on experience the responsible engineer optimises the calibration to reach the defined targets concerning drivability. It is clear that the quality of the results is dependent on the experience and skills of the calibration engineers involved. In order to meet the requirements with the expected quality in the required time, new calibration methods must be developed. An efficient approach is to transfer the calibration process from the road to chassis dynamometer or even HiL test bed (keyword road to rig to lab). The presented methodology of automated and model based engine drivability calibration has been successfully applied on the chassis dynamometer. The preliminary investigations show promising results for the future implementation of this method on the HiL test bed. The increased efficiency of this approach is derived from the objective drivability evaluation, the unmanned automated testing, the independence of the method from external influences on the road and the possibility to generate different tuning variants without the necessity of running further tests. The shorter and more efficient use of prototype vehicles, which are only needed for the system identification test runs, result in the possibility to cut down the number of expensive vehicles needed within the calibration process. The results show that the automated and model based optimization produces calibration data of high quality and enables a considerable increase in the efficiency of the calibration process. This new method is the next step in the AVL approach handling the widening of calibration effort due to increases in complexity, the number of application variants and the demands placed on fuel consumption, emissions and comfort. In combination with the calibration of automated transmissions on the chassis dynamometer using the same measuring principle AVL can offer a complete power train calibration. This calibration follows the presented method, meaning the calibration can be realized automated and model based, fulfilling the high demand of present market.


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    Title :

    Automated and model based drivability calibration on chassis-dynamometer and HiL test bed


    Additional title:

    Automatische und modellbasierte Kalibrierung von Fahrverhaltenfunktionen am Rollenprüfstand/HiL-Prüfstand


    Contributors:


    Publication date :

    2009


    Size :

    16 Seiten, 11 Bilder, 5 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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